#include <iostream>
#include <cmath>
#include <cstdio>

using namespace std;

double f(double x, int n)
{
	if (n == 1)
		return x / (1 + x);
	else
		return x / (n + f(x, n-1)); 
}

int main()
{
	double x;
	int n;
	cin >> x >> n;
	double ret = f(x, n);
	printf("%.2lf\n", ret);

	return 0;
}
